Dissertations / Pursuing MA-Psychology: choosing latest Ph.D topic in HRM [3]

Hi

I have done MBA-HR and presently pursuing MA-Psychology. I need help in selecting a Ph.D topic in HRM. Few topics of my interests are

Change Management
Performance Management
Reward Management
Conflict Management

Out of these my choice would be Change Management/Transformational Management.

Please do suggest any latest topics apart from those mentioned above.

Would appreciate any help in this regard.

Regards

hasini